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Getting Started

Concepts

Guides

Agentic Checkout Protocol

Hosted REST API

SDK · CLI · MCP

Reference

Reference Reason codes Policy fields Type contract

Reference

Reference

Look-it-up tables — the full reason-code vocabulary, every policy field, and the shared type contract.

The flat, scannable lookups.

Reason codes

The complete SCREAMING_SNAKE_CASE rejection vocabulary, by category.

Policy fields

Every MerchantPolicy field, its default, and the code it fires.

Type contract

The shared TypeScript interfaces the whole protocol agrees on.

MCP server

The agent's install — @veto-protocol/mcp adds the buyer-side checkout flow as MCP tools so an agent in Claude, Cursor, or Continue can transact against any protocol-speaking merchant.

Reason codes

The complete, stable rejection vocabulary. Every rejection (and several accepts) carries one or more of these SCREAMING_SNAKE_CASE codes — a stable API surface an agent keys off.